Oh no! The water! I'm in big trouble if I don't fetch it!
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In the universe of Kingdom Hearts, a being is composed of three parts: a body, a soul and a heart. The heart gives a being emotion, feelings, light and darkness.
All hearts have both light and darkness within them. The only exceptions are the Princesses of Heart, maidens whose hearts are made out of pure light. The light and darkness within a heart conflict and define a person, allowing them to exist.
If an individual, be it good or evil, gives into the darkness of their heart, it will become a Heartless, a being of pure darkness. This being separates from the body and soul to act on its own instinct. This primal instinct drives the Heartless to seek out other hearts and consume them, turning them into Heartless. However, when a Heartless is destroyed by the Keyblade, the darkness releases its grip, and the captive heart is freed. Eventually, these freed hearts congregate and collect together to make Kingdom Hearts.
If a person with a strong heart and will becomes a Heartless, then the body and soul left behind may begin to act with a will of its own. This being is called a Nobody. If the person's heart was particularly strong, that Nobody may even retain its human form and memories, but will still lack true emotions which come from the heart. These specific nobodies are, of course, known as part of Organization XIII. Nobodies are considered "not to exist". The reason is that they do not posses light nor darkness, which are located in the heart.
Memories are also tied to the heart. If a person's memory collapses, such as the Riku Replica, their heart will collapse as well, rendering their body into a lifeless doll.
Tarzan says that friends are always in your "##%&#" (meaning "hearts" in gorilla language).
Connection to the Keyblade
So far, the only known requirements to wield a Keyblade is to have a strong heart, and have faith in your friends. The Keyblade of the Realm of Light chose Sora as its master because of the love and light within his Heart. Riku was able to take the Keyblade from Sora because Riku had sold his Heart to the power of Darkness and Sora was also unsure of his friends at the time making his faith weaker. But when Goofy decides to take block Sora from Riku's Dark Firaga Sora realizes that the Keyblade responds to ones Heart and the Keyblade returns to him. King Mickey found the Keyblade of the Realm of Darkness and became its master. Roxas was able to wield the Keyblade because he was Sora's nobody. Riku later found/created himself a Keyblade, speculated to be the keyblade of the Realm of In Between. Even Kairi, a Princess of Heart, was able to wield a Keyblade.
The connection between the Heart and the Keyblade is expected to be further explored in the series.